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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang-format mishandles macroized "if constexpr""
href="https://bugs.llvm.org/show_bug.cgi?id=39248">39248</a>
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<th>Summary</th>
<td>clang-format mishandles macroized "if constexpr"
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Formatter
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sfinae@hotmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>djasper@google.com, klimek@google.com, llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>MSVC's STL partially macroizes "if constexpr" to work with compilers in pure
C++14 mode. clang-format handles this poorly:
C:\Temp>type bug.cpp
#include <stdio.h>
#include <type_traits>
#define CONSTEXPR_IF constexpr
template <typename T> void meow(T) {
if CONSTEXPR_IF (std::is_integral_v<T>) {
puts("integral");
} else {
puts("other");
}
}
int main() {
meow(1729);
meow(3.14);
}
C:\Temp>clang-format -style=LLVM bug.cpp
#include <stdio.h>
#include <type_traits>
#define CONSTEXPR_IF constexpr
template <typename T> void meow(T) {
if
CONSTEXPR_IF(std::is_integral_v<T>) { puts("integral"); }
else {
puts("other");
}
}
int main() {
meow(1729);
meow(3.14);
}
I believe it would be better if clang-format treated unrecognized identifiers
immediately after "if" the same way that it treats "if constexpr".</pre>
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